Science

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Across
  1. 1. Sound that bounces back to you (4 letters)
  2. 6. Lets light pass through clearly (11 letters)
  3. 7. Curved piece of glass that bends light (4 letters)
  4. 9. Opening in your eye that lets light in (5 letters)
  5. 11. Smooth surface that reflects light (6 letters)
  6. 12. Clear front part of your eye (6 letters)
  7. 13. When sound waves spread apart, creating areas of lower pressure (11 letters)
  8. 15. Part of your eye that detects light (6 letters)
Down
  1. 2. You can't see through this at all (6 letters)
  2. 3. source Something that produces light (11 letters - two words)
  3. 4. How high or low a sound is (5 letters)
  4. 5. Lets some light through but you can't see clearly through it (11 letters)
  5. 8. When sound waves are squeezed together (11 letters)
  6. 10. wave Vibrations that travel through air to your ears (9 letters - two words)
  7. 14. ray Straight line of light (8 letters - two words)